chapter 26 section 1 Flashcards Preview

Biology > chapter 26 section 1 > Flashcards

Flashcards in chapter 26 section 1 Deck (15):
1

protozoans are members of the kingdom

protista

2

3 characteristics that are found in protozoans are

heterotrophy, motility, parasitism

3

all protozoa are capable of

asexual reproduction

4

many protozoa survive under extreme environmental conditions by

becoming dormant inside a hardened external covering

5

protozoa are though to have evolved from

early eukaryotes

6

in what type of ecosystem are zooplankton found? what role do they play in such ecosystems

aquatic ecosystems
one of the primary sources of energy (food)

7

name two human diseases caused by protozoa

malaria, amebic dysentery, giardiasis

8

list three factors that can trigger cyst formation in protozoa

nutrient deficiency, changes in temperature or pH, drought

9

bacteria and protozoa both undergo conjugation. why is this process more complex in protozoa than in bacteria.

since protists are eukaryotes, their chromosomes are contained inside a nucleus, which must break down and then reform for conjugation to occur. Bacteria lack a nucleus, so division and exchange of genetic information is easier

10

why are there no free living protozoa in environments that are dry year round

protozoa live in only aquatic environments
environments without water lack protozoa

11

short hairlike projections

cilium

12

contains digestive enzymes where food is broken down

food vacuole

13

long hairlike structures used for moving

flagellum

14

detects changes in quantity and quality of light

eyespot

15

large, rounded cytoplasmic extensions. moves sarcodina

pseudopodium